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Section no.4 of Songming (Xiaopu) to Kunming section expressway subgrade in the National highway network G85 Chongqing to Kunming expressway

On the contract Section 4 of the Ming-Kunming Expressway to Kunming Expressway, the starting pile number is k17+200~k32+000, and the total length is 14.8km. It adopts six-lane expressway standard with a design speed of 100 km/h and a subgrade width of 33.5 m. The design load of the bridge and culvert of the whole line is Highway-I level.